package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();

        log.info("本次拦截的请求: {}", requestURI);

        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg"
        };

        if (check(urls, requestURI)) {
            log.info("本次请求不需要处理: {}", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录: {}", request.getSession().getAttribute("employee"));

            BaseContext.setCurrentId((Long) request.getSession().getAttribute("employee"));

            filterChain.doFilter(request, response);
            return;
        }

        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录: {}", request.getSession().getAttribute("user"));

            BaseContext.setCurrentId((Long) request.getSession().getAttribute("user"));

            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录: {}", requestURI);
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    }

    /**
     * 判断本次请求是否需要处理
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url: urls) {
            if (PATH_MATCHER.match(url, requestURI)) {
                return true;
            }
        }
        return false;
    }
}
